The halogen lamp is an incandescent lamp itself, differing from the classic lamp in only one single feature: the filament is surrounded by a - usually small-sized - quartz bulb, which contains some neutral gas and a small amount of halogen element (iodine,, bromine).
The presence of the halogens improve the luminous efficacy and lengthen the lifespan of the bulb, as a result of the so called halogen regenerative cycle.The essence of the halogen regenerative cycle: the evaporated tungsten reacts with the halogen compound within the gas space to form tungsten iodide (more specifically tungsten oxyiodid). The compound decomposes in the proximity of the filament and the tungsten is re-deposited onto the hotter parts. As the thinnest parts of the filament are the hottest, an automatic regenerative process is induced. This cycle enables an increase in the temperature of the filament, which benefits the luminous efficacy, but increases UV-radiation as well. In order for the halogen cycle to start, it is indispensable for the bulb to reach a certain heat.
They look similar to classic household bulbs, however halogen bulbs are much more efficient. They consume 30% less energy and last twice as long as classic ones. Furthermore they produce full brightness instantly after switching on and they are compatible with dimmer switches as well.
Where are they recommended to use?
They are ideal for places where illumination is needed for relatively short intervals with frequent switching.
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